Always review GitHub Actions workflows for security implications before merging, particularly focusing on authentication mechanisms and credential handling. Understand what permissions like `id-token: write` grant and their potential attack vectors. Ensure secure defaults are explicitly configured, such as disabling credential persistence. Key security considerations: - Understand JWT token permissions and their scope: "It allows GHA actions to request a JWT token on behalf of your repository" - Be aware of potential abuse scenarios: "Bad Guys could get a hold of it during an actual execution of this workflow" - Explicitly disable credential persistence to prevent vulnerabilities: `persist-credentials: false` - Use security scanning tools to identify configuration issues When implementing new authentication mechanisms, ensure team members understand the security model and document any special permissions required for maintainer approval.